RMS 400 watts 4 ohm voice coil Made for extremely deep bass Triple-stacked magnet 3” voice coil Hyper-extended pole  Vented top plate Built to order Designed with an extended pole piece and an incredible four inches of peak-to-peak excursion, the X v.2 is engineered for ultra-deep bass and high power handling. Engineered to set a new standard in the low-frequency/small-ported-box subwoofer category, the X Series can also work in up to a 50% larger enclosure if you desire even more low-end extension. The X v.2 series differentiates itself with its incredibly linear suspension, ensuring the lowest level of bass extension in a small enclosure while maintaining extremely low levels of distortion. Notably, the v.2 series features a much larger motor structure (220mm vs. 190mm on the V.1 series), improved motor ventilation, and an all-new Mega-Roll v.2 surround, providing a more linear and rugged update to the world-famous Mega-Roll v.1 surround design. Specifications T/S SPECS X 6.5″ S4 RE (Ohms) 2.9 FS (Hz) 55.778 VAS (L) 1.657 Qes 0.619 Qms 9.255 Qts 0.581 Le (mH) 0.60 BL (NA) 11.702 Mms (Grams) 83.452 Cms (uM/N) 97.561 Sens (dB @ 1w/1m) 78.5db Enclosure Specifications X 6.5″ S4 Sealed Enclosure .15 cu. ft.  Ported Enclosure 0.25cuft – 0.4 cu. ft. NET Recommended Tuning 35-45hz Recommended Port Area 3.5-6 sq in Displacement 0.03 cu ft Depth Outside Diam. Cutout Physical Dimensions Download